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The Missionary's Cookbook 5 is one of the many Key Items found throughout Elden Ring, found at the Siofra River Aqueduct past Nokron, Eternal City.
The Missionary's Cookbook 5 is a Key Item Recipe Book that will unlock extra crafting recipes once you have obtained it.
This includes the following recipes:
This item is found in Siofra River Aqueduct, located past Nokron, Eternal City on the far northeastern side past the Ancestral Woods to the Aqueduct Facing Cliffs, in a room beyond the Crucible Knight.